[silent build] part 1 - Makefile infrastructure for silent build. This commit also fixes a small dependency issue - makes all binary formats rely on the .elf file
[silent build] part 2 - redirect python stdout to 'nowhere' on non-verbose builds
[silent build] part 3 - mute pininfo script on non-verbose builds by including common.py
[silent build] default to verbose output on python scripts - only silence on silent build
Merge pull request #96 from ebirger/silent_build

Silent build